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function* expression

The function* keyword can be used to define a generator function inside an expression.

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Syntax

function* (param0) {
  statements
}
function* (param0, param1) {
  statements
}
function* (param0, param1, /* … ,*/ paramN) {
  statements
}

function* name(param0) {
  statements
}
function* name(param0, param1) {
  statements
}
function* name(param0, param1, /* … ,*/ paramN) {
  statements
}

Parameters

name Optional: The function name. Can be omitted, in which case the function is anonymous. The name is only local to the function body.
paramN Optional: The name of an argument to be passed to the function. A function can have up to 255 arguments.
statements Optional: The statements which comprise the body of the function.

Description

A function* expression is very similar to and has almost the same syntax as a function* statement. The main difference between a function* expression and a function* statement is the function name, which can be omitted in function* expressions to create anonymous generator functions. See also the chapter about functions for more information.

Examples

Using function*

The following example defines an unnamed generator function and assigns it to x. The function yields the square of its argument:

const x = function* (y) {
  yield y * y;
};

Specifications

Specification
ECMAScript Language Specification # sec-generator-function-definitions

Browser compatibility

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	Deno	Node.js
`function*`	49	12	26	No	36	10	49	49	26	36	10	5.0	1.0	4.0.0
`trailing_comma`	58	79	52	No	45	10	58	58	52	43	10	7.0	1.0	8.0.0